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Part4 - Yocto tutorial

Add package to images

#yocto   #qemu   #101  

Table of Content

Yocto project tree#

  • meta-external
  • meta-openembedded
  • poky
meta-external share git project across multiple yocto project

Help

  • git submodule
  • git submodule add
  • git submodule update –init –recursive

meta-external#

Collection of yocto git repositories from git

meta-openembedded
git submodule add https://github.com/openembedded/meta-openembedded.git

layers#

Add layers to bblayers.conf file

bitbake-layers show-layers
NOTE: Starting bitbake server...
layer                 path                                      priority
==========================================================================
meta                  /home/user/yocto/poky/meta                5
meta-poky             /home/user/yocto/poky/meta-poky           5
meta-yocto-bsp        /home/user/yocto/poky/meta-yocto-bsp      5
meta-oe               /home/user/yocto/meta-external/meta-openembedded/meta-oe  6
meta-python           /home/user/yocto/meta-external/meta-openembedded/meta-python  7

Add dropbear ssh#

OpenEmbedded#

Search for dropbear recipe in openembedded Layer index

Check

openembedded-core is part of poky meta ? Yes I found dropbear under meta/recipes-core/dropbear

setup#

  • Add to local.conf
append to local.conf
CORE_IMAGE_EXTRA_INSTALL += "dropbear"

Note

  • IMAGE_INSTALL is the variable that controls what is included in any image.
  • CORE_IMAGE_EXTRA_INSTALL is a convenience variable that enable you to add extra packages to an image based on the core-image class

Create image#

# from build folder
bitbake core-image-minimal

Check#

# under build folder
ll tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0-r0/rootfs/usr/sbin/dropbear

run image with qemu#

run image
runqemu tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64-<build number>.qemuboot.conf nographic
check dropbear is running
ps | grep drop
  259 root      3020 S    /usr/sbin/dropbear -r /etc/dropbear/dropbear_rsa_host_key -p 22 -B
  293 root      4224 S    grep drop

ssh from host#

ssh root@192.168.7.2

check recipe location#

bitbake -e dropbear | grep ^FILE=
# Result
FILE="/home/user/yocto/poky/meta/recipes-core/dropbear/dropbear_2020.81.bb"
#

Add python3#

  • Search recipe

  • Show recipe more info

setup#

  • Add to local.conf
append to local.conf
CORE_IMAGE_EXTRA_INSTALL += "dropbear python3"

check recipe location#

bitbake -e python3 | grep ^FILE=
FILE="/home/user/yocto/poky/meta/recipes-devtools/python/python3_3.9.9.bb"

Create image#

# from build folder
bitbake core-image-minimal